| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: ra_ppm.c,v 2.18 2025/06/06 19:11:21 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* program to convert between RADIANCE and Poskanzer Pixmaps |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <math.h> |
| 9 |
#include <ctype.h> |
| 10 |
#include "platform.h" |
| 11 |
#include "rtio.h" |
| 12 |
#include "color.h" |
| 13 |
#include "resolu.h" |
| 14 |
|
| 15 |
#define fltv(i) (((i)+.5)/(maxval+1.)) |
| 16 |
int bradj = 0; /* brightness adjustment */ |
| 17 |
double gamcor = 2.2; /* gamma correction value */ |
| 18 |
int maxval = 255; /* maximum primary value */ |
| 19 |
int xmax, ymax; |
| 20 |
|
| 21 |
typedef int colrscanf_t(COLR *scan, int len, FILE *fp); |
| 22 |
typedef int colorscanf_t(COLOR *scan, int len, FILE *fp); |
| 23 |
|
| 24 |
static colrscanf_t agryscan, bgryscan, aclrscan, bclrscan; |
| 25 |
static void ppm2ra(colrscanf_t *getscan); |
| 26 |
static void ra2ppm(int binary, int grey); |
| 27 |
|
| 28 |
static colorscanf_t agryscan2, bgryscan2, aclrscan2, bclrscan2; |
| 29 |
static void ppm2ra2(colorscanf_t *getscan); |
| 30 |
static void ra2ppm2(int binary, int grey); |
| 31 |
|
| 32 |
static int normval(unsigned int v); |
| 33 |
static unsigned int scanint(FILE *fp); |
| 34 |
static unsigned int intv(double v); |
| 35 |
static unsigned int getby2(FILE *fp); |
| 36 |
static void putby2(unsigned int w, FILE *fp); |
| 37 |
static void quiterr(char *err); |
| 38 |
|
| 39 |
|
| 40 |
int |
| 41 |
main( |
| 42 |
int argc, |
| 43 |
char *argv[] |
| 44 |
) |
| 45 |
{ |
| 46 |
char inpbuf[2]; |
| 47 |
int gryflag = 0; |
| 48 |
int binflag = 1; |
| 49 |
int reverse = 0; |
| 50 |
int ptype; |
| 51 |
int i; |
| 52 |
|
| 53 |
fixargv0(argv[0]); |
| 54 |
|
| 55 |
for (i = 1; i < argc; i++) |
| 56 |
if (argv[i][0] == '-') |
| 57 |
switch (argv[i][1]) { |
| 58 |
case 's': |
| 59 |
maxval = atoi(argv[++i]) & 0xffff; |
| 60 |
break; |
| 61 |
case 'b': |
| 62 |
gryflag = 1; |
| 63 |
break; |
| 64 |
case 'g': |
| 65 |
gamcor = atof(argv[++i]); |
| 66 |
break; |
| 67 |
case 'e': |
| 68 |
if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
| 69 |
goto userr; |
| 70 |
bradj = atoi(argv[++i]); |
| 71 |
break; |
| 72 |
case 'a': |
| 73 |
binflag = 0; |
| 74 |
break; |
| 75 |
case 'r': |
| 76 |
reverse = !reverse; |
| 77 |
break; |
| 78 |
default: |
| 79 |
goto userr; |
| 80 |
} |
| 81 |
else |
| 82 |
break; |
| 83 |
|
| 84 |
if (i < argc-2) |
| 85 |
goto userr; |
| 86 |
if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
| 87 |
fprintf(stderr, "%s: can't open input \"%s\"\n", |
| 88 |
progname, argv[i]); |
| 89 |
exit(1); |
| 90 |
} |
| 91 |
if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
| 92 |
fprintf(stderr, "%s: can't open output \"%s\"\n", |
| 93 |
progname, argv[i+1]); |
| 94 |
exit(1); |
| 95 |
} |
| 96 |
if (maxval < 256) |
| 97 |
setcolrgam(gamcor); |
| 98 |
if (reverse) { |
| 99 |
/* get header */ |
| 100 |
if (read(fileno(stdin), inpbuf, 2) != 2 || inpbuf[0] != 'P') |
| 101 |
quiterr("input not a Poskanzer Pixmap"); |
| 102 |
ptype = inpbuf[1]; |
| 103 |
#if defined(_WIN32) || defined(_WIN64) |
| 104 |
if (ptype > 4) |
| 105 |
SET_FILE_BINARY(stdin); |
| 106 |
SET_FILE_BINARY(stdout); |
| 107 |
#endif |
| 108 |
xmax = scanint(stdin); |
| 109 |
ymax = scanint(stdin); |
| 110 |
maxval = scanint(stdin); |
| 111 |
/* put header */ |
| 112 |
newheader("RADIANCE", stdout); |
| 113 |
printargs(i, argv, stdout); |
| 114 |
fputformat(COLRFMT, stdout); |
| 115 |
putchar('\n'); |
| 116 |
fprtresolu(xmax, ymax, stdout); |
| 117 |
/* convert file */ |
| 118 |
if (maxval >= 256) |
| 119 |
switch (ptype) { |
| 120 |
case '2': |
| 121 |
ppm2ra2(agryscan2); |
| 122 |
break; |
| 123 |
case '5': |
| 124 |
ppm2ra2(bgryscan2); |
| 125 |
break; |
| 126 |
case '3': |
| 127 |
ppm2ra2(aclrscan2); |
| 128 |
break; |
| 129 |
case '6': |
| 130 |
ppm2ra2(bclrscan2); |
| 131 |
break; |
| 132 |
default: |
| 133 |
quiterr("unsupported Pixmap type"); |
| 134 |
} |
| 135 |
else |
| 136 |
switch (ptype) { |
| 137 |
case '2': |
| 138 |
ppm2ra(agryscan); |
| 139 |
break; |
| 140 |
case '5': |
| 141 |
ppm2ra(bgryscan); |
| 142 |
break; |
| 143 |
case '3': |
| 144 |
ppm2ra(aclrscan); |
| 145 |
break; |
| 146 |
case '6': |
| 147 |
ppm2ra(bclrscan); |
| 148 |
break; |
| 149 |
default: |
| 150 |
quiterr("unsupported Pixmap type"); |
| 151 |
} |
| 152 |
} else { |
| 153 |
#if defined(_WIN32) || defined(_WIN64) |
| 154 |
SET_FILE_BINARY(stdin); |
| 155 |
if (binflag) |
| 156 |
SET_FILE_BINARY(stdout); |
| 157 |
#endif |
| 158 |
/* get header info. */ |
| 159 |
if (checkheader(stdin, COLRFMT, NULL) < 0 || |
| 160 |
fgetresolu(&xmax, &ymax, stdin) < 0) |
| 161 |
quiterr("bad picture format"); |
| 162 |
/* write PPM header */ |
| 163 |
printf("P%1d\n%d %d\n%u\n", (gryflag?2:3)+(binflag?3:0), |
| 164 |
xmax, ymax, maxval); |
| 165 |
/* convert file */ |
| 166 |
if (maxval >= 256) |
| 167 |
ra2ppm2(binflag, gryflag); |
| 168 |
else |
| 169 |
ra2ppm(binflag, gryflag); |
| 170 |
} |
| 171 |
exit(0); |
| 172 |
userr: |
| 173 |
fprintf(stderr, |
| 174 |
"Usage: %s [-r][-a][-b][-s maxv][-g gamma][-e +/-stops] [input [output]]\n", |
| 175 |
progname); |
| 176 |
exit(1); |
| 177 |
} |
| 178 |
|
| 179 |
|
| 180 |
static void |
| 181 |
quiterr( /* print message and exit */ |
| 182 |
char *err |
| 183 |
) |
| 184 |
{ |
| 185 |
if (err != NULL) { |
| 186 |
fprintf(stderr, "%s: %s\n", progname, err); |
| 187 |
exit(1); |
| 188 |
} |
| 189 |
exit(0); |
| 190 |
} |
| 191 |
|
| 192 |
|
| 193 |
static void |
| 194 |
ppm2ra( /* convert 1-byte Pixmap to Radiance picture */ |
| 195 |
colrscanf_t *getscan |
| 196 |
) |
| 197 |
{ |
| 198 |
COLR *scanout; |
| 199 |
int y; |
| 200 |
/* allocate scanline */ |
| 201 |
scanout = (COLR *)malloc(xmax*sizeof(COLR)); |
| 202 |
if (scanout == NULL) |
| 203 |
quiterr("out of memory in ppm2ra"); |
| 204 |
/* convert image */ |
| 205 |
for (y = ymax-1; y >= 0; y--) { |
| 206 |
if ((*getscan)(scanout, xmax, stdin) < 0) |
| 207 |
quiterr("error reading Pixmap"); |
| 208 |
gambs_colrs(scanout, xmax); |
| 209 |
if (bradj) |
| 210 |
shiftcolrs(scanout, xmax, bradj); |
| 211 |
if (fwritecolrs(scanout, xmax, stdout) < 0) |
| 212 |
quiterr("error writing Radiance picture"); |
| 213 |
} |
| 214 |
/* free scanline */ |
| 215 |
free((void *)scanout); |
| 216 |
} |
| 217 |
|
| 218 |
|
| 219 |
static void |
| 220 |
ra2ppm( /* convert Radiance picture to 1-byte/sample Pixmap */ |
| 221 |
int binary, |
| 222 |
int grey |
| 223 |
) |
| 224 |
{ |
| 225 |
COLR *scanin; |
| 226 |
register int x; |
| 227 |
int y; |
| 228 |
/* allocate scanline */ |
| 229 |
scanin = (COLR *)malloc(xmax*sizeof(COLR)); |
| 230 |
if (scanin == NULL) |
| 231 |
quiterr("out of memory in ra2ppm"); |
| 232 |
/* convert image */ |
| 233 |
for (y = ymax-1; y >= 0; y--) { |
| 234 |
if (freadcolrs(scanin, xmax, stdin) < 0) |
| 235 |
quiterr("error reading Radiance picture"); |
| 236 |
if (bradj) |
| 237 |
shiftcolrs(scanin, xmax, bradj); |
| 238 |
for (x = grey?xmax:0; x--; ) |
| 239 |
scanin[x][GRN] = normbright(scanin[x]); |
| 240 |
colrs_gambs(scanin, xmax); |
| 241 |
if (grey) |
| 242 |
if (binary) |
| 243 |
for (x = 0; x < xmax; x++) |
| 244 |
putc(scanin[x][GRN], stdout); |
| 245 |
else |
| 246 |
for (x = 0; x < xmax; x++) |
| 247 |
printf("%d\n", scanin[x][GRN]); |
| 248 |
else |
| 249 |
if (binary) |
| 250 |
for (x = 0; x < xmax; x++) { |
| 251 |
putc(scanin[x][RED], stdout); |
| 252 |
putc(scanin[x][GRN], stdout); |
| 253 |
putc(scanin[x][BLU], stdout); |
| 254 |
} |
| 255 |
else |
| 256 |
for (x = 0; x < xmax; x++) |
| 257 |
printf("%d %d %d\n", scanin[x][RED], |
| 258 |
scanin[x][GRN], |
| 259 |
scanin[x][BLU]); |
| 260 |
if (ferror(stdout)) |
| 261 |
quiterr("error writing Pixmap"); |
| 262 |
} |
| 263 |
/* free scanline */ |
| 264 |
free((void *)scanin); |
| 265 |
} |
| 266 |
|
| 267 |
|
| 268 |
static void |
| 269 |
ppm2ra2( /* convert 2-byte Pixmap to Radiance picture */ |
| 270 |
colorscanf_t *getscan |
| 271 |
) |
| 272 |
{ |
| 273 |
COLOR *scanout; |
| 274 |
double mult; |
| 275 |
int y; |
| 276 |
register int x; |
| 277 |
/* allocate scanline */ |
| 278 |
scanout = (COLOR *)malloc(xmax*sizeof(COLOR)); |
| 279 |
if (scanout == NULL) |
| 280 |
quiterr("out of memory in ppm2ra2"); |
| 281 |
if (bradj) |
| 282 |
mult = pow(2., (double)bradj); |
| 283 |
/* convert image */ |
| 284 |
for (y = ymax-1; y >= 0; y--) { |
| 285 |
if ((*getscan)(scanout, xmax, stdin) < 0) |
| 286 |
quiterr("error reading Pixmap"); |
| 287 |
for (x = (gamcor>1.01)|(gamcor<0.99)?xmax:0; x--; ) { |
| 288 |
colval(scanout[x],RED) = |
| 289 |
pow(colval(scanout[x],RED), gamcor); |
| 290 |
colval(scanout[x],GRN) = |
| 291 |
pow(colval(scanout[x],GRN), gamcor); |
| 292 |
colval(scanout[x],BLU) = |
| 293 |
pow(colval(scanout[x],BLU), gamcor); |
| 294 |
} |
| 295 |
for (x = bradj?xmax:0; x--; ) |
| 296 |
scalecolor(scanout[x], mult); |
| 297 |
if (fwritescan(scanout, xmax, stdout) < 0) |
| 298 |
quiterr("error writing Radiance picture"); |
| 299 |
} |
| 300 |
/* free scanline */ |
| 301 |
free((void *)scanout); |
| 302 |
} |
| 303 |
|
| 304 |
|
| 305 |
static void |
| 306 |
ra2ppm2( /* convert Radiance picture to Pixmap (2-byte) */ |
| 307 |
int binary, |
| 308 |
int grey |
| 309 |
) |
| 310 |
{ |
| 311 |
COLOR *scanin; |
| 312 |
double mult, d; |
| 313 |
register int x; |
| 314 |
int y; |
| 315 |
/* allocate scanline */ |
| 316 |
scanin = (COLOR *)malloc(xmax*sizeof(COLOR)); |
| 317 |
if (scanin == NULL) |
| 318 |
quiterr("out of memory in ra2ppm2"); |
| 319 |
if (bradj) |
| 320 |
mult = pow(2., (double)bradj); |
| 321 |
/* convert image */ |
| 322 |
for (y = ymax-1; y >= 0; y--) { |
| 323 |
if (freadscan(scanin, xmax, stdin) < 0) |
| 324 |
quiterr("error reading Radiance picture"); |
| 325 |
for (x = bradj?xmax:0; x--; ) |
| 326 |
scalecolor(scanin[x], mult); |
| 327 |
for (x = grey?xmax:0; x--; ) |
| 328 |
colval(scanin[x],GRN) = bright(scanin[x]); |
| 329 |
d = 1./gamcor; |
| 330 |
for (x = (d>1.01)|(d<0.99)?xmax:0; x--; ) { |
| 331 |
colval(scanin[x],GRN) = pow(colval(scanin[x],GRN), d); |
| 332 |
if (!grey) { |
| 333 |
colval(scanin[x],RED) = |
| 334 |
pow(colval(scanin[x],RED), d); |
| 335 |
colval(scanin[x],BLU) = |
| 336 |
pow(colval(scanin[x],BLU), d); |
| 337 |
} |
| 338 |
} |
| 339 |
if (grey) |
| 340 |
if (binary) |
| 341 |
for (x = 0; x < xmax; x++) |
| 342 |
putby2(intv(colval(scanin[x],GRN)), |
| 343 |
stdout); |
| 344 |
else |
| 345 |
for (x = 0; x < xmax; x++) |
| 346 |
printf("%u\n", |
| 347 |
intv(colval(scanin[x],GRN))); |
| 348 |
else |
| 349 |
if (binary) |
| 350 |
for (x = 0; x < xmax; x++) { |
| 351 |
putby2(intv(colval(scanin[x],RED)), |
| 352 |
stdout); |
| 353 |
putby2(intv(colval(scanin[x],GRN)), |
| 354 |
stdout); |
| 355 |
putby2(intv(colval(scanin[x],BLU)), |
| 356 |
stdout); |
| 357 |
} |
| 358 |
else |
| 359 |
for (x = 0; x < xmax; x++) |
| 360 |
printf("%u %u %u\n", |
| 361 |
intv(colval(scanin[x],RED)), |
| 362 |
intv(colval(scanin[x],GRN)), |
| 363 |
intv(colval(scanin[x],BLU))); |
| 364 |
if (ferror(stdout)) |
| 365 |
quiterr("error writing Pixmap"); |
| 366 |
} |
| 367 |
/* free scanline */ |
| 368 |
free((void *)scanin); |
| 369 |
} |
| 370 |
|
| 371 |
|
| 372 |
static int |
| 373 |
agryscan( /* get an ASCII greyscale scanline */ |
| 374 |
register COLR *scan, |
| 375 |
register int len, |
| 376 |
FILE *fp |
| 377 |
) |
| 378 |
{ |
| 379 |
while (len-- > 0) { |
| 380 |
scan[0][RED] = |
| 381 |
scan[0][GRN] = |
| 382 |
scan[0][BLU] = normval(scanint(fp)); |
| 383 |
scan++; |
| 384 |
} |
| 385 |
return(0); |
| 386 |
} |
| 387 |
|
| 388 |
|
| 389 |
static int |
| 390 |
bgryscan( /* get a binary greyscale scanline */ |
| 391 |
register COLR *scan, |
| 392 |
int len, |
| 393 |
register FILE *fp |
| 394 |
) |
| 395 |
{ |
| 396 |
register int c; |
| 397 |
|
| 398 |
while (len-- > 0) { |
| 399 |
if ((c = getc(fp)) == EOF) |
| 400 |
return(-1); |
| 401 |
if (maxval != 255) |
| 402 |
c = normval(c); |
| 403 |
scan[0][RED] = |
| 404 |
scan[0][GRN] = |
| 405 |
scan[0][BLU] = c; |
| 406 |
scan++; |
| 407 |
} |
| 408 |
return(0); |
| 409 |
} |
| 410 |
|
| 411 |
|
| 412 |
static int |
| 413 |
aclrscan( /* get an ASCII color scanline */ |
| 414 |
register COLR *scan, |
| 415 |
register int len, |
| 416 |
FILE *fp |
| 417 |
) |
| 418 |
{ |
| 419 |
while (len-- > 0) { |
| 420 |
scan[0][RED] = normval(scanint(fp)); |
| 421 |
scan[0][GRN] = normval(scanint(fp)); |
| 422 |
scan[0][BLU] = normval(scanint(fp)); |
| 423 |
scan++; |
| 424 |
} |
| 425 |
return(0); |
| 426 |
} |
| 427 |
|
| 428 |
|
| 429 |
static int |
| 430 |
bclrscan( /* get a binary color scanline */ |
| 431 |
register COLR *scan, |
| 432 |
int len, |
| 433 |
register FILE *fp |
| 434 |
) |
| 435 |
{ |
| 436 |
int r, g, b; |
| 437 |
|
| 438 |
while (len-- > 0) { |
| 439 |
r = getc(fp); |
| 440 |
g = getc(fp); |
| 441 |
if ((b = getc(fp)) == EOF) |
| 442 |
return(-1); |
| 443 |
if (maxval == 255) { |
| 444 |
scan[0][RED] = r; |
| 445 |
scan[0][GRN] = g; |
| 446 |
scan[0][BLU] = b; |
| 447 |
} else { |
| 448 |
scan[0][RED] = normval(r); |
| 449 |
scan[0][GRN] = normval(g); |
| 450 |
scan[0][BLU] = normval(b); |
| 451 |
} |
| 452 |
scan++; |
| 453 |
} |
| 454 |
return(0); |
| 455 |
} |
| 456 |
|
| 457 |
|
| 458 |
static int |
| 459 |
agryscan2( /* get an ASCII greyscale scanline */ |
| 460 |
register COLOR *scan, |
| 461 |
register int len, |
| 462 |
FILE *fp |
| 463 |
) |
| 464 |
{ |
| 465 |
while (len-- > 0) { |
| 466 |
colval(scan[0],RED) = |
| 467 |
colval(scan[0],GRN) = |
| 468 |
colval(scan[0],BLU) = fltv(scanint(fp)); |
| 469 |
scan++; |
| 470 |
} |
| 471 |
return(0); |
| 472 |
} |
| 473 |
|
| 474 |
|
| 475 |
static int |
| 476 |
bgryscan2( /* get a binary greyscale scanline */ |
| 477 |
register COLOR *scan, |
| 478 |
int len, |
| 479 |
register FILE *fp |
| 480 |
) |
| 481 |
{ |
| 482 |
register int c; |
| 483 |
|
| 484 |
while (len-- > 0) { |
| 485 |
if ((c = getby2(fp)) == EOF) |
| 486 |
return(-1); |
| 487 |
colval(scan[0],RED) = |
| 488 |
colval(scan[0],GRN) = |
| 489 |
colval(scan[0],BLU) = fltv(c); |
| 490 |
scan++; |
| 491 |
} |
| 492 |
return(0); |
| 493 |
} |
| 494 |
|
| 495 |
|
| 496 |
static int |
| 497 |
aclrscan2( /* get an ASCII color scanline */ |
| 498 |
register COLOR *scan, |
| 499 |
register int len, |
| 500 |
FILE *fp |
| 501 |
) |
| 502 |
{ |
| 503 |
while (len-- > 0) { |
| 504 |
colval(scan[0],RED) = fltv(scanint(fp)); |
| 505 |
colval(scan[0],GRN) = fltv(scanint(fp)); |
| 506 |
colval(scan[0],BLU) = fltv(scanint(fp)); |
| 507 |
scan++; |
| 508 |
} |
| 509 |
return(0); |
| 510 |
} |
| 511 |
|
| 512 |
|
| 513 |
static int |
| 514 |
bclrscan2( /* get a binary color scanline */ |
| 515 |
register COLOR *scan, |
| 516 |
int len, |
| 517 |
register FILE *fp |
| 518 |
) |
| 519 |
{ |
| 520 |
int r, g, b; |
| 521 |
|
| 522 |
while (len-- > 0) { |
| 523 |
r = getby2(fp); |
| 524 |
g = getby2(fp); |
| 525 |
if ((b = getby2(fp)) == EOF) |
| 526 |
return(-1); |
| 527 |
scan[0][RED] = fltv(r); |
| 528 |
scan[0][GRN] = fltv(g); |
| 529 |
scan[0][BLU] = fltv(b); |
| 530 |
scan++; |
| 531 |
} |
| 532 |
return(0); |
| 533 |
} |
| 534 |
|
| 535 |
|
| 536 |
static unsigned int |
| 537 |
scanint( /* scan the next positive integer value */ |
| 538 |
register FILE *fp |
| 539 |
) |
| 540 |
{ |
| 541 |
register int c; |
| 542 |
register unsigned int i; |
| 543 |
tryagain: |
| 544 |
while (isspace(c = getc(fp))) |
| 545 |
; |
| 546 |
if (c == EOF) |
| 547 |
quiterr("unexpected end of file"); |
| 548 |
if (c == '#') { /* comment */ |
| 549 |
while ((c = getc(fp)) != EOF && c != '\n') |
| 550 |
; |
| 551 |
goto tryagain; |
| 552 |
} |
| 553 |
/* should be integer */ |
| 554 |
i = 0; |
| 555 |
do { |
| 556 |
if (!isdigit(c)) |
| 557 |
quiterr("error reading integer"); |
| 558 |
i = 10*i + c - '0'; |
| 559 |
c = getc(fp); |
| 560 |
} while (c != EOF && !isspace(c)); |
| 561 |
return(i); |
| 562 |
} |
| 563 |
|
| 564 |
|
| 565 |
static int |
| 566 |
normval( /* normalize a value to [0,255] */ |
| 567 |
register unsigned int v |
| 568 |
) |
| 569 |
{ |
| 570 |
if (v >= maxval) |
| 571 |
return(255); |
| 572 |
if (maxval == 255) |
| 573 |
return(v); |
| 574 |
return(v*255L/maxval); |
| 575 |
} |
| 576 |
|
| 577 |
|
| 578 |
static unsigned int |
| 579 |
getby2( /* return 2-byte quantity from fp */ |
| 580 |
register FILE *fp |
| 581 |
) |
| 582 |
{ |
| 583 |
register int lowerb, upperb; |
| 584 |
|
| 585 |
upperb = getc(fp); |
| 586 |
lowerb = getc(fp); |
| 587 |
if (lowerb == EOF) |
| 588 |
return(EOF); |
| 589 |
return(upperb<<8 | lowerb); |
| 590 |
} |
| 591 |
|
| 592 |
|
| 593 |
static void |
| 594 |
putby2( /* put 2-byte quantity to fp */ |
| 595 |
register unsigned int w, |
| 596 |
register FILE *fp |
| 597 |
) |
| 598 |
{ |
| 599 |
putc(w>>8 & 0xff, fp); |
| 600 |
putc(w & 0xff, fp); |
| 601 |
if (ferror(fp)) { |
| 602 |
fprintf(stderr, "%s: write error on PPM output\n", progname); |
| 603 |
exit(1); |
| 604 |
} |
| 605 |
} |
| 606 |
|
| 607 |
|
| 608 |
static unsigned int |
| 609 |
intv( /* return integer quantity for v */ |
| 610 |
register double v |
| 611 |
) |
| 612 |
{ |
| 613 |
if (v >= 0.99999) |
| 614 |
return(maxval); |
| 615 |
if (v <= 0.) |
| 616 |
return(0); |
| 617 |
return((int)(v*(maxval+1))); |
| 618 |
} |
